Answer 120
2. The distance between the two right-angle vertices of the right-angle trapezoid and the midpoint of the opposite waist ()
A. unequal
C. it may or may not be equal. This is impossible to compare.
Answer a
3. Among the following propositions, the correct one is ()
Two quadrilaterals with equal diagonals are parallelograms.
Two quadrangles with equal diagonal lines and perpendicular to each other are rectangles.
A quadrilateral with two diagonal lines bisecting each other vertically is a diamond.
A quadrilateral with two diagonal lines bisecting each other and being equal is a square.
Answer c
4. If the diagonal length of a square is 2 cm, then the area of this square is ().
A.4 B.2 C. D
Answer b